PEROGNATHUS. 361 



of interparietal, 7.2; interorbital constriction, 7; length of nasals, 

 10.6. 



a, ziicntfcic (Pefognatkus), Osgood, N. Am. Faun., No. 18, 1900, 



P- 45- 

 ZACATECAS POCKET MOUSE. 



Type locality. Valparaiso, State of Zacatecas, Mexico. 



Geogr. Distr. States of Zacatecas and Guanajuato, Mexico. 



Gcnl. Char. Similar to P. hispidus, but larger and darker. 



Color. Upper parts olive brown; lateral line ochraceous; under 

 parts white; spots on side of whiskers black; tail black above, white 

 beneath. 



Measurements. Total length, 211; tail vertebrae, 105; hind foot, 

 27.5. Skull: occipito-nasal length, 30.2; Hensel, 22.5; greatest mas- 

 toid breadth, 15; length of interparietal, 4; greatest width of inter- 

 parietal, 8; interorbital constriction, 7; length of nasals, 12. 



b, paradoxus (Perognathus) , Merr., N. Am. Faun., No. i, 1889, 

 p. 24, pi. in, fig. 18. Elliot, Syn. N. Am. Mamm., 1901, p. 252. 

 STRANGE POCKET MOUSE. 



Type locality. Banner, Trego County, Kansas. 



Geogr. Distr. State of Sonora, north to northern and western 

 Kansas. 



Genl. Char. Large; ears large, with antitragal lobes; soles naked. 



Color. Above yellowish brown, lined with black; sides fulvous; 

 fore legs fulvous outside; feet and under parts white; tail above 

 fuliginous, beneath white, tinged with fulvous. 



Measurements. Total length, 205-242 (Merr. measurements, 1. c. 

 100 mm. error); tail vertebrae, 113; hind foot, 26; ears, 5. Skull: 

 occipito-nasal length, 32; Hensel, 24; greatest mastoid breadth, 15; 

 length of interparietal, 4.7; greatest width of interparietal, 8; inter- 

 orbital constriction, 7.5; length of nasals, 13.2. 



365. baileyi (Perognathiis} , Merr., Proc. Acad. Nat. Scien. Phil., 

 1894, p. 262, fig. i. Elliot, Syn. N. Am. Mamm., 1901, p. 251. 

 BAILEY'S POCKET MOUSE. 



Type locality. Magdalena, State of Sonora, Mexico. 



Geogr. Distr. States of Sonora and Lower California, Mexico, 

 into Arizona. 



Gcnl. Char. Large; tail very much longer than head and body; 

 mastoids considerably developed; bullae nearly meeting below basi- 

 sphenoid; interparietal pentagonal, broadest anteriorly. 



Color. Above drab brown, lined with black; beneath white; 

 pale lateral stripe; tail above dusky, beneath white. 



